ELECTRIC ELEVATOR MOTORS
- Elevators, and lifting-platforms have been in use since as early as the 3rd century BC, and most were driven by human, animal, or water-wheel power.
- Since the middle of the 19th century, many elevators were powered by steam, which were typically used in conveying materials such as coal, raw materials for production, or agriculture.
- Electric elevators, as we know them, were first used near the end of the 19th century, and the first of which were built by Werner von Siemens in 1880.
The majority of modern day commercial cargo and passenger elevators utilize either an AC electric motor, or DC electric motor for movement, and/or door actuation, and any combination of AC/DC controls.
The first step in locating the correct replacement motor for your application should be to speak with an SRVC Electric Motors specialist, or simply email us today with your elevator motors specifications, including make and model number, and you’ll receive an immediate response.
If your current elevator application utilizes a “standard” dry application hydraulic motor, belt-drive electric motor, submersible hollow-shaft electric motor, or elevator door motor please refer to the nameplate of the motor for all the critical information required to enable our SRVC Electric specialist to locate the correct replacement for your application.
REPLACEMENTS AVAILABLE FOR:
Otis – Anton Freissler – Fujitec – Haughton Elevator Company – Hitachi – Kone – Marshall Elevator – Montgomery Elevator – Schindler Elevator Corporation – Thyssen Krupp
If you are wondering whether to replace, or reuse your current electrical elevator motor and drive system please consider the following:
- FOR GEARED APPLICATIONS
Drive and motor selection are affected by the condition of the geared machine. When changing to a new machine, you should consider a new AC motor and drive package.
CAR SPEEDS TO 150 FPM (.75 m/s)
• Existing: Old AC motor
Recommendation: Replace with New AC motor; use inverter drive
• Existing: DC motor in good condition
Recommendation: Retain DC motor (especially above 40 HP)
• Existing: Old DC motor, below 40 HP
Recommendation: Replace with New AC motor; use inverter drive (40 HP or above use Flux Vector Drive).
• Existing: Non-standard motor frame (hard-to-find/expensive replacement) SRVC Electric may be able to help you locate a replacement. Give us a call…
Recommendation: Recondition (overhaul/rewind) existing AC motor
• Existing: Building has stringent RFI and EMI requirements
Recommendation: Avoid changing to AC; however, when changing to AC, system may require grounding and additional filtering, obviously higher costs.
CAR SPEEDS FROM 150 TO 450 FPM (.75 m/s to 2 m/sec)
• Existing: Old AC motor
Recommendation: Replace with New AC motor; use flux vector drive.
• Existing: DC motor in good condition
Recommendation: Retain DC motor (especially above 40 HP)
• Existing: Old DC motor, 40 HP or less
Recommendation: Both DC and AC are good choices.
Considerations: RFI and EMI requirements; lead time, staff training, etc. If this is your first conversion to AC there is an increased risk of making costly mistakes (ie: such as incorrect layout of equipment or wiring, no RFI filter, no drive isolation transformer).
• Existing: AC motor above 30 HP or:
Helical gear machine or…
Car speed above 300 fpm or…
More than one car in the machine room
Recommendation: Considerable heat will be generated when overhauling.
This heat must be removed from the machine room in order to keep the controller cabinet temperature below 104°F.
When replacing an existing AC or DC motor with a new AC motor, the following issues should be taken into consideration. A new motor can provide better performance and help reduce adjustment time (hidden cost). When buying a new motor, be sure it is designed for AC drive applications, otherwise known as inverter-duty.
_ the new motor Full Load RPM should match existing motor RPM within 5%
Note: Verify the existing motor name plate full load RPM at contract speed.
_ Verify correct slip as described above.
_ Motor should be designed for AC drive applications (proper winding wire insulation).
Performance:
A matched motor and drive pair will deliver the best ride quality. A byproduct of using the correct motor and drive is reduced adjustment time.
With regard to adjustment, AC systems should be able to achieve performance standards comparable to that of DC SCR systems, provided that the proper drive and motor are selected.
Recognize that AC drives have an inherent delay in starting, which may affect overall elevator performance time. Unlike DC applications, where the motor field is energized at all times, in AC applications, the motor is energized (via power contactor) on demand.
Sufficient time must be allowed for magnetic flux to build within the motor before the brake can be lifted and the elevator car operated. Delay time may vary from 200 milliseconds to over one second, depending on motor characteristics. Therefore, all other factors being the same, the AC motor and drive must tolerate a delay on start which does not exist with DC motors and drives.
Brands include:
Marathon Electric, Fasco Electric, Universal Electric/AOSmith,
Magnetek Electric / AO Smith , GE, Emerson Electric,
US Electric, Rotom, Century Electric, AO Smith Electric,
Leeson Electric, Baldor Electric, Reliance Electric,
Lincoln Electric, Morse, Franklin Electric, Imperial Electric
Siemens Electric, Delco Electric, Gould Electric
SRVC Electric Motors can provide you with the best prices, and deepest discounts, not to mention an invaluable ability to identify the correct replacement.
We’re here to help you locate the right replacement motor, pump, or VFD.
Send us an email with your motor specifications, application details, or requirements and we’ll help you come up with the most economically feasible replacement.
Most orders ship same day from stocking locations throughout the USA.
SRVC Electric Motors
ROY HALL – Technical Assistance / Sales
BURTON, MICHIGAN 48509 USA
PHONE: (810)820-2940
Email: roy@srvcelectricmotors.com
WEB: https://srvcelectricmotors.com/
HOURS: Monday – Friday 7:00 AM – 6:00 PM EDT